CN118210170A - Backlight module, display device and assembly method - Google Patents

Abstract

The application discloses a backlight module, a display device and an assembling method, wherein the backlight module comprises: the backboard comprises a bottom plate and side plates which are arranged around the periphery of the bottom plate in a surrounding manner, and the bottom plate and the side plates form a containing cavity; a light guide plate disposed in the accommodation cavity, the light guide plate having a light incident side and a light emergent side opposite to the light incident side; the lamp strip comprises a circuit board arranged between the light incident side and the side plate and a luminous body arranged on the circuit board; the limiting assembly comprises a first limiting part, wherein the first limiting part is arranged between the light emitting side and the side plate, and the first limiting part is in interference fit with the light guide plate; wherein, the bottom of light guide plate in the income light side is equipped with the chamfer. When the light incident side is arranged in the accommodating cavity, the circuit board of the lamp strip is avoided through the chamfer, the circuit board is prevented from being scratched in the process of installing the light guide plate, meanwhile, the problem that the circuit board is scratched to the light incident side in the signal tolerance experiment to cause electric leakage is avoided, and finally the problems of electric leakage caused by damage of the circuit board and black screen of the display module are avoided.

Description

Backlight module, display device and assembly method

Technical Field

The application belongs to the technical field of display equipment, and particularly relates to a backlight module, a display device and an assembly method.

Background

In recent years, the application range of the display device is continuously expanded, and the market of several large consumer applications such as smart phones, smart bracelets, smart televisions, tablet computers and the like is slowly growing, but along with the heat of the automobile market, the vehicle-mounted display market demands such as large-screen central control and instrument panels are increasingly increased, so as to meet the demands of people on vehicle-mounted display.

In the related art, the backlight module can generate the problems of electric leakage, poor functionality such as module black screen and the like in the credit tolerance test process, and can not meet the severe credit tolerance requirement of vehicle-mounted display.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The application aims to at least solve the technical problem that the backlight module cannot meet the reliability and tolerance experiment requirements to a certain extent. Therefore, the application provides a backlight module, a display device and an assembly method.

The embodiment of the application provides a backlight module, which comprises:

the backboard comprises a bottom board and side boards surrounding the periphery of the bottom board, and the bottom board and the side boards form a containing cavity;

A light guide plate disposed in the accommodation chamber, the light guide plate having a light incident side and a light emergent side opposite to the light incident side;

the lamp strip comprises a circuit board arranged between the light incident side and the side plate and a luminous body arranged on the circuit board;

The limiting assembly comprises a first limiting part, wherein the first limiting part is arranged between the light emergent side and the side plate, and the first limiting part is in interference fit with the light guide plate;

The bottom of the light guide plate on the light incident side is provided with a chamfer.

In some embodiments, the light guide plate is provided with a lug on the light incident side, and the chamfer is located at the bottom of the lug.

In some embodiments, the depth of the chamfer extending in the light incident side to the light emergent side direction is greater than or equal to the interference between the first limiting portion and the light guide plate.

In some embodiments, the interference between the first limiting portion and the light guide plate is 0.2±0.1mm.

In some embodiments, the chamfer has a height in the thickness direction of the light guide plate that is less than or equal to one half the thickness of the light guide plate.

In some embodiments, the light guide plate has a side wall adjacent to the light incident side and the light emergent side, and the limiting assembly further includes a second limiting portion perpendicularly connected to the first limiting portion, the second limiting portion being located between the side wall and the side plate.

In some embodiments, the spacing assembly is connected to the side plate by an adhesive layer.

In some embodiments, the material of the limiting component is an elastic material.

The embodiment of the application also provides a display device, which comprises the backlight module.

The embodiment of the application also provides an assembly method of the backlight module, which comprises the following steps:

Providing a back plate;

providing a limiting assembly, and fixing the limiting assembly on a side plate of the backboard through an adhesive layer;

And providing a light guide plate, abutting the light emitting side of the light guide plate on a first limiting part of the limiting assembly, pressing the light entering side, and loading the light guide plate into the accommodating cavity of the backboard.

The embodiment of the application has at least the following beneficial effects:

Above-mentioned backlight unit, the backplate has the bottom plate and encloses the curb plate of establishing at the bottom plate periphery, and bottom plate and curb plate form and hold the chamber in order to set up backlight unit such as light guide plate, are equipped with the lamp strip at the income light side of light guide plate, are equipped with spacing subassembly's first spacing portion at the light-emitting side of light guide plate. When the light guide plate is arranged in the backboard, the first limiting part can be fixed on the side plate opposite to the light emitting side in advance, then the light emitting side of the light guide plate is abutted against the first limiting part, and then the light entering side of the light guide plate is arranged in the accommodating cavity.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows an exploded schematic view of a backlight module according to an embodiment of the application;

Fig. 2 is a schematic structural view of a light guide plate of the backlight module in fig. 1;

Fig. 3 is a partial cross-sectional view of a backlight module according to an embodiment of the application;

fig. 4 shows an enlarged view of the light guide plate at a in fig. 3.

Reference numerals:

100. a back plate; 110. a bottom plate; 120. a side plate; 200. a reflection sheet; 300. a light guide plate; 310. a light incident side; 311. chamfering; 320. a light-emitting side; 330. a lug; 340. the mounting position of the limiting component; 400. a lower diffusion sheet; 500. a lower prism; 600. a polarizing plate; 700. a rubber frame; 800. foam adhesive tape; 900. a limit component; 1000. a light bar; 1100. and a heat conducting adhesive tape.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

The application is described below with reference to specific embodiments in conjunction with the accompanying drawings:

As shown in fig. 1 and 3, a backlight module according to an embodiment of the present application includes:

the backboard 100 comprises a bottom plate 110 and a side plate 120 which is arranged around the periphery of the bottom plate 110, wherein the bottom plate 110 and the side plate 120 form a containing cavity;

a light guide plate 300 disposed in the receiving cavity, the light guide plate 300 having a light incident side 310 and a light emergent side 320 opposite to the light incident side 310;

the light bar 1000 includes a circuit board disposed between the light incident side 310 and the side plate 120 and a light emitter disposed on the circuit board;

The limiting assembly 900 comprises a first limiting portion, wherein the first limiting portion is arranged between the light emitting side 320 and the side plate 120, and the first limiting portion is in interference fit with the light guide plate 300;

the light guide plate 300 is provided with a chamfer 311 at the bottom of the light incident side 310.

In the backlight module of the present embodiment, the back plate 100 has a bottom plate 110 and a side plate 120 surrounding the bottom plate 110, the bottom plate 110 and the side plate 120 form a receiving cavity to set backlight components such as the light guide plate 300, the light entrance side 310 of the light guide plate 300 is provided with the light bar 1000, and the light exit side 320 of the light guide plate 300 is provided with the first limiting portion of the limiting component 900. When the light guide plate 300 is installed in the back plate 100, the first limiting part can be fixed on the side plate 120 opposite to the light emitting side 320 in advance, then the light emitting side 320 of the light guide plate 300 is abutted against the first limiting part, and then the light entering side 310 of the light guide plate 300 is installed in the accommodating cavity, so that the assembly sequence can avoid the defect that the light emitting side 320 of the light guide plate 300 is crushed to generate scraps to cause defects such as white spots and the like in the letter resistance test process, and the bottom of the light entering side 310 of the light guide plate 300 is provided with the chamfer 311, so that when the light entering side 310 of the light guide plate 300 is installed in the accommodating cavity, the circuit board of the lamp strip 1000 can be avoided through the chamfer 311, the circuit board is prevented from being scratched in the installation process of the light guide plate 300, meanwhile, the circuit board is prevented from being scratched in the letter resistance test, and finally the problem of avoiding the occurrence of the leakage resistance and the black screen of the display module caused by the circuit board damage is solved.

With the popularity of electric vehicles, the demand of vehicle-mounted backlight modules is increasing year by year. The following problems are that the flexible circuit board of the backlight module is damaged, and the problems of poor white spots or poor electric leakage and the like exist in the signal tolerance test. After the research and analysis show that, in the assembly process of the backlight module, the first limiting portion is arranged on the side plate 120 of the ground back plate 100, the light incident side 310 of the light guide plate 300 is propped against the circuit board of the light incident side 310, and then the light emergent side 320 of the light guide plate 300 is assembled, so that the light emergent side 320 is forced to be arranged into the accommodating cavity of the back plate 100 through the first limiting portion, and the light guide plate 300 and the first limiting portion are used for fixing and limiting the light guide plate 300, so that the first limiting portion and the light guide plate 300 are in interference fit, and the first limiting portion is easy to crush to generate scraps when the light emergent side 320 of the light guide plate 300 is assembled, so that the backlight module detects the defects such as white spots in the signal tolerance experiment. In order to avoid the problem that the backlight module generates the defects such as white spots, the application proposes to change the assembly sequence of the backlight module, after the first limiting portion is disposed on the side plate 120 of the back plate 100, the light-emitting side 320 of the light guide plate 300 is abutted against the first limiting portion, and then the light-entering side 310 of the light guide plate 300 is assembled, and the movement trace of the bottom of the light-entering side 310 is on the circuit board during the installation of the light-entering side 310 of the light guide plate 300, so that the circuit board is easily scratched by contact with the circuit board, resulting in the defects such as electric leakage, brightness, and the like, and the reliability cannot be passed.

In the embodiment of the application, in order to solve the problem that the backlight module cannot meet the requirements of the signal tolerance test due to the assembly defect, the embodiment of the application changes the assembly method of the light guide plate 300, and firstly, the light guide plate 300 is assembled to be abutted to one side of the first limiting part, so that interference fit with the first limiting part is ensured, the problem that the backlight module generates poor white spots can be avoided, and the backlight module can smoothly pass the signal tolerance test; when the light guide plate 300 is assembled laterally by the circuit board, the structure of the light guide plate 300 is further improved, and the bottom of the joint of the light guide plate 300 and the circuit board is provided with the chamfer 311, so that the light guide plate 300 is prevented from being scratched by the circuit board through the chamfer 311 in the assembling process, the backlight module can smoothly pass through a signal tolerance experiment, and the experiment requirement that electric leakage and brightness cannot be generated in the signal tolerance experiment is met. Further, the bottom of the light-entering side 310 of the light guide plate 300 in this embodiment is provided with the chamfer 311, the top of the light-entering side 310 still maintains the original structure, the top of the light-entering side 310 of the light guide plate 300 can be abutted on the side plate 120 after installation, the fixation of the light guide plate 300 can be ensured, the circuit board can be avoided through the chamfer 311, the assembly efficiency of the backlight module can be effectively improved, and the reject ratio of the backlight module assembly is reduced.

As an alternative implementation, as shown in fig. 1, the backlight module of this embodiment includes a back plate 100, a reflective sheet 200, a light guide plate 300, an optical film, a frame 700, a foam tape 800, a limiting component 900, a light bar 1000, and a heat conductive tape 1100. The back plate 100 includes a bottom plate 110 and a side plate 120, the side plate 120 is enclosed around the bottom plate 110 to form a receiving cavity on the back plate 100, and various film layers in the backlight module are supported by the back plate 100. The light bar 1000 includes a circuit board and a light emitting body, wherein the light emitting body may be a Light Emitting Diode (LED), and the light emitting diode may be soldered on the circuit board, and the circuit board may be a common printed circuit board or a flexible circuit board. In this embodiment, the backlight module of the present application is exemplified by a circuit board of the light bar 1000 as a flexible circuit board. The light bar 1000 is disposed at least on the side plate 120 opposite to the light incident side 310 of the light guide plate 300, for providing a light source for a backlight, and the light bar 1000 may be adhered to the side plate 120 by a heat conductive adhesive tape 1100. The first spacing portion of spacing subassembly 900 sets up between the light-emitting side 320 of light guide plate 300 and curb plate 120, and first spacing portion can be through double faced adhesive tape, gluing agent etc. paste on curb plate 120, and fix light guide plate 300 in holding the chamber through the interference fit of first spacing portion and light guide plate 300, realize location and cushioning effect through first spacing portion, can avoid light guide plate 300 to produce problems such as vibration abnormal sound in the use. The reflective sheet 200, the light guide plate 300 and the optical film are sequentially stacked in the accommodating cavity, the reflective sheet 200 is used for reflecting light to prevent the light from being absorbed by the back plate 100, and the light guide plate 300 is used for changing the propagation direction of the light. The optical film may include a lower diffusion sheet 400, a lower prism 500, and a polarizing plate 600. The adhesive frame 700 is adhered to the back plate 100 through the foam adhesive tape 800 to be matched with the back plate 100 to fix each membrane in the backlight module in the accommodating cavity in a pressing manner, and in addition, the adhesive frame 700 can be connected with the back plate 100 through a buckle and other structures, so that the connection strength of the adhesive frame 700 and the back plate 100 is improved, and the backlight module is more stable and reliable.

In addition, the backlight module may further have a structure such as a light shielding tape disposed at a corresponding position according to the need, or specific structures of the back plate 100, the reflective sheet 200, the light guide plate 300, the optical film material, the frame 700, the foam tape 800, the limiting component 900, the light bar 1000, and the heat conducting tape 1100 in the backlight module may be adaptively increased or changed according to the design need, which is not described herein.

As an alternative embodiment, as shown in fig. 2 and 3, the light guide plate 300 is provided with a lug 330 at the light incident side 310, and a chamfer 311 is located at the bottom of the lug 330. In the present embodiment, the two ends of the light incident side 310 of the light guide plate 300 are respectively provided with the convex lugs 330, and since the convex lugs 330 protrude from other positions of the light incident side 310, the distance between the convex lugs 330 and the circuit board is closer when the light incident side 310 is installed, and interference is easily generated with the circuit board, so that the circuit board is scratched. By providing the bottom of the ledge 330 with the chamfer 311, the chamfer 311 at the bottom of the ledge 330 can clear away the circuit board during installation, thereby avoiding scraping the circuit board.

As an alternative embodiment, as shown in fig. 3 and 4, the depth c of the chamfer 311 extending from the light incident side 310 toward the light emergent side 320 is greater than or equal to the interference between the first limiting portion and the light guide plate 300. In this embodiment, by limiting the depth c of the chamfer 311, it can be ensured that the retraction amount of the chamfer 311 on the light guide plate 300 counteracts the interference of the first limiting portion in the installation process of the light incident side 310 of the light guide plate 300, so that the light incident side 310 of the light guide plate 300 can completely avoid the circuit board in the installation process, and the bottom of the light incident side 310 is prevented from contacting the circuit board, thereby preventing the circuit board from being scratched.

The first limiting portion is used for fixing the light guide plate 300 in the accommodating cavity of the back plate 100, and has a buffering function, so that the phenomena of collision, friction and the like of the light guide plate 300 in the accommodating cavity are avoided, and the interference with the light guide plate 300 can be determined according to the overall size of the light guide plate 300. As an alternative implementation manner, in the backlight module of this embodiment, the interference between the first limiting portion and the light guide plate 300 is 0.2±0.1mm. For example, the interference between the first limiting part and the light guide plate 300 may be 0.1mm, 0.2mm, 0.3mm, etc.

As an alternative embodiment, as shown in fig. 3 and 4, in the backlight module of the present embodiment, the height b of the chamfer 311 in the thickness direction of the light guide plate 300 is less than or equal to one half of the thickness a of the light guide plate 300. That is, in the thickness direction of the light guide plate 300, the indented area of the chamfer 311 occupies only less than half the thickness a of the light guide plate 300, and the top remaining portion of the light incident side 310 of the light guide plate 300 is more than half the thickness a of the light guide plate 300. In the installation process of the light incident side 310 of the light guide plate 300, the bottom of the light incident side 310 can avoid the circuit board due to the chamfer 311 locking into a part, the top reserved part of the light incident side 310 can be abutted on the side plate 120 after the light incident side 310 is installed in place, the fixation of the light guide plate 300 can be ensured under the action of the first limit part,

As an alternative embodiment, as shown in fig. 1 and 2, the light guide plate 300 has sidewalls adjacent to the light incident side 310 and the light exiting side 320, and the spacing assembly 900 further includes a second spacing portion vertically connected to the first spacing portion, the second spacing portion being located between the sidewalls and the side plate 120. For example, in the present embodiment, the first limiting portion and the second limiting portion are vertically connected to form an L-shaped integral structure, and are mounted at the top angles of the side plates 120 corresponding to the light emitting side 320 and the side walls, respectively, and the mounting positions 340 of the limiting assemblies on the light guide plate are as shown in fig. 2, that is, the light incident side 310 and the side walls of the light guide plate 300 can be respectively abutted to the first limiting portion and the second limiting portion, and the light guide plate 300 is fixed together by the first limiting portion and the second limiting portion, so that the position of the light guide plate 300 in the accommodating cavity is more firmly fixed.

As an alternative embodiment, the spacing assembly 900 is connected to the side plate 120 by an adhesive layer. In the assembly process of the backlight module, the limiting assembly 900 is first fixed on the side plate 120, and the limiting assembly 900 can be adhered to the side plate 120 through an adhesive layer to connect with the side plate 120. The adhesive layer can be made of adhesive materials such as optical adhesive or double-sided adhesive.

As an alternative embodiment, the material of the stop assembly 900 is an elastic material. In this embodiment, the material of the limiting component 900 is an elastic material, so that the limiting component 900 and the light guide plate 300 can be in interference fit, for example, the limiting component 900 may be made of elastic materials such as rubber, silica gel, etc., which is not limited herein.

The second large aspect of the application also provides a display device, which comprises the backlight module.

Because the display device provided by the invention comprises the backlight module of the technical scheme, the display device provided by the invention has all the beneficial effects of the backlight module, and the description is omitted here.

The third aspect of the present application further provides an assembling method of the above backlight module, where the assembling method of the backlight module includes the following steps:

Providing a back plate 100;

Providing a limiting assembly 900, and fixing the limiting assembly 900 on the side plate 120 of the backboard 100 through an adhesive layer;

The light guide plate 300 is provided, the light emitting side 320 of the light guide plate 300 is abutted against the first limiting portion of the limiting assembly 900, and the light guide plate 300 is mounted in the accommodating cavity of the back plate 100 by pressing the light emitting side 310.

In the method for assembling the backlight module of the embodiment, by changing the sequence of loading the light incident side 310 and the light emergent side 320 of the light guide plate 300 into the accommodating cavity and the structure of the light guide plate 300, the phenomenon that the rubber pad serving as the first limiting part is crushed to generate scraps when the light emergent side 320 is loaded later can be avoided, and further, the backlight module is prevented from generating bad white spots and detecting bad white spots in a signal tolerance test; the circuit board can be prevented from being scratched easily when the backlight module is installed on the light incident side 310, and the circuit board is damaged in the credit resistance test, so that the backlight module is prevented from generating adverse phenomena such as electric leakage and the like; further, the assembly sequence of the light emitting side 320 of the light guide plate 300 being installed first and the light entering side 310 of the light guide plate 300 being installed later is adopted, so that the assembly of the production line can be facilitated, and the interference fit between the light guide plate 300 and the limit component 900 is ensured.

It should be noted that, in the method for assembling a backlight module of the present embodiment, the method for assembling other constituent structures of the backlight module may be performed according to a conventional assembling method, and is not limited by the assembling manner of the light guide plate 300. For example, the backlight module is further provided with a reflective plate, so that the reflective plate is disposed on the bottom plate 110 before the limit assembly 900 or the light guide plate 300 is assembled. The optical films such as the lower diffusion sheet 400, the lower prism 500, the polarizer 600, etc. provided in the backlight module may be assembled according to the related assembly method after the light guide plate 300 is assembled, and will not be described again here.

In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

It should be noted that all the directional indicators in the embodiments of the present application are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.

In the present application, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The utility model provides a backlight unit which characterized in that, backlight unit includes:

the backboard comprises a bottom board and side boards surrounding the periphery of the bottom board, and the bottom board and the side boards form a containing cavity;

A light guide plate disposed in the accommodation chamber, the light guide plate having a light incident side and a light emergent side opposite to the light incident side;

the lamp strip comprises a circuit board arranged between the light incident side and the side plate and a luminous body arranged on the circuit board;

The limiting assembly comprises a first limiting part, wherein the first limiting part is arranged between the light emergent side and the side plate, and the first limiting part is in interference fit with the light guide plate;

The bottom of the light guide plate on the light incident side is provided with a chamfer.

2. The backlight module according to claim 1, wherein the light guide plate is provided with a lug on the light incident side, and the chamfer is positioned at the bottom of the lug.

3. The backlight module according to claim 1, wherein the depth of the chamfer extending in the light incident side to the light emergent side direction is greater than or equal to the interference between the first limiting portion and the light guide plate.

4. A backlight module according to claim 3, wherein the interference between the first limiting portion and the light guide plate is 0.2±0.1mm.

5. The backlight module according to claim 1, wherein the height of the chamfer in the thickness direction of the light guide plate is equal to or less than half the thickness of the light guide plate.

6. The backlight module according to any one of claims 1 to 5, wherein the light guide plate has a side wall adjacent to the light incident side and the light exiting side, and the limiting assembly further comprises a second limiting portion vertically connected to the first limiting portion, the second limiting portion being located between the side wall and the side plate.

7. The backlight module according to claim 6, wherein the limiting component is connected with the side plate through an adhesive layer.

8. The backlight module according to claim 6, wherein the limiting component is made of elastic material.

9. A display device comprising a backlight module according to any one of claims 1 to 8.

10. A method of assembling a backlight unit according to any one of claims 1 to 8, comprising the steps of:

Providing a back plate;

providing a limiting assembly, and fixing the limiting assembly on a side plate of the backboard through an adhesive layer;

And providing a light guide plate, abutting the light emitting side of the light guide plate on a first limiting part of the limiting assembly, pressing the light entering side, and loading the light guide plate into the accommodating cavity of the backboard.